On Tue, 10 May 2016 14:27:20 -0700, sml...@gmail.com wrote:
> It may have to do with their signature (as reported by the
> `.signature` introspection method):

They're actually special-cased in the grammar[^1] based on their name: 


If it's possible to determine whether the name belongs to a non-core routine at 
the point where the error is emitted in the grammar, that'd be one way of 
avoiding the issue.

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